Window-fastener.



D. L. MGCORKINDALE.

WINDOW FASTBNBR. APPLICATION FILED SEPT. 1, '1910.

Panam-.ea June '30, 1914.

R. 0 T M V m W'TNESSES:

DUNCAN L. MCCORKINDALE, OF IIOLYOKE,y MASSACHUSETTS.

WINDOW-FASTENER.

Specification of Letters Patent.

Patented J une 30, 1914.

Application filed September 1, 1910. Serial No. 579,967.

T0 @ZZ LU/wm it may concer-a:

Be it known that I, DUNCAN L. MCCORK- INDALE, a citizen of the Unitedv States of America, residing at Holyoke, in the county of I-Iampden and State of Massachusetts, have invented a new and useful Window- Fastener, of which the following is a specification.

My invention relates to improvements in automatic or semiautomatic locking devices for windows, and consists essentially of a member of certain peculiar construction having a cam-locking surface and one or more dead-locking points, such member beingl designed to be pivotally attached to one sic e of a window casing, as hereinafter more fully set forth.

The object of my invention is to provide an inexpensive safety catch for windows, which, though simple in construction and operation and easily and quickly applied, is, nevertheless, strong and any point of elevation, and of holding it against anythingless than a force suiiicient to break and destroy some of the surrounding or adjacent parts. It is practically impossible to open a window, secured with this device, from the outside, without, as already intimated, actually breaking some part or parts.

A further object is to provide a cam fastener with at least one and for the lower sash usually two dead-locks Awhich will be brought into operation in the event the camlock fails to hold, as when the window' fits loosely in the casing and is forced by said cam-lock, the dead locks on the fastener having two coming into action sequentially.

I attain these objects by the means illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of a window fastener which embodies my invention in a practical form, such fastener being for a lower sash; Fig. 2, a front side elevation of said fastener, showing it applied to a window easing and in operative relation to the lower window sash; Fig. 3, a similar view, showing the first dead-lock in engage ment with said sash; Fig. 4L, still another similar view, showing the second dead-lock in action, and, Fig. 5, a front side elevation durable and cakpable of locking a window sash at practically of a fastener suitable for sash.

Similar figures refer to similar parts throughout the several views.

In Figs. 2, 3 and 4t, a fragment of the lefthand side of a window casing appears at l, and a fragment of the abutting side of a lower window sash at 2. At 8 is represented the glass, in section, in the sash 2. Either form of the fastener comprises a head L having a peripheral cam-locking surface or cam-lock 5, the face of such surface being widened by means of a flange 6 on the front side of said head and coinciding peripherally with the corresponding edge of said head, and a dead-locking point or deadlock 7 produced by giving more or less of a sharp edge to said cam-lock at one end, and preferably reversing the curve slightly adjacent to said dead-lock.

In addition to the elements mentioned above, the lower sash-fastener has a tailpiece 8 which is provided with a dead-lock-A4 an upper window ing point or dead-lock 9 at its outer end, Y

formed by beveling such end to give more or less of a sharp edge to this part, said deadlock being coincident with the inner edge of said tail-piece. The dead-locks 7 and 9 are parallel with the axis of the fastener, represented here by a screw l0 which passes through an opening 1l, Fig. l, in the head 4, to secure said fastener to the casing l and upon which said fastener is free to swing. The transverse direction of the camlock 5 at all points is also parallel with the aforesaid aXis. As here shown, the head a has a beak-like configuration at one end, and the dead-lock 7 forms the outer terminal of this portion of said head. the fastener is so constructed that an acute angle would be formed by two lines extending from the two dead-locks to the axial center of said fastener, since the proper operation of said dead-locks, or the actuation into engagement with the sash of the dead-lock 9 by the dead-lock 7, when the latter fails to hold, isfthus insured.

Owing to the fact that, for an upper sash, the fastener must bridge the space above the lower sash, I provide the fastener for such upper sash with a longer tail-piece, as shown at l2, in Fig. 5, and locate the opening for the screw or other pivotal member far By preference,

enough from the head e in said tail-piece to enable said member' to be inserted in the side of the casing as before. The opening justA referred te appears at 13. Necessarily, the second. deaddoclr is omitted from this fassequently to rock the fastener so that the latter presents still higher parts of the cam, the greater the resistance offered by said fastener in conjunction with the other i frictionally-engaging part-s. In the event, tener, and it might be, of course, from the however, that the cam-lock 5 fails to hold other. lither fastener is preferably hung the window, a possible contingency due to on the pivot or screw l0 so that the low 7 part of the cam-lock 5 contacts with the sash Fig. 9.

@wing to the shape of the head d, and more especially to the shape of the cam edge of the same, the bottom sash can be lowered or the top sash raised freely and without interference on the part of the fastener, unless said fastener be tightly engaged therewith in the manner described below, but when either sash is moved in the` opposite direction, that is, in the direction to open it, the tendency of said fastener is to automatically leek the sash, by reason of 'the fact that said fastener is then rocked on pivot 10 in such. a way that its cam-lock o binds on said sash and crowds it so hard against the parting strip (not shown), in the case of the lower sash, or against .the outer side (not shown) of the groove ory channel 1G, lfigs. 3 and il, in the casing for the windows, in the case of the upper sash, that the frictional resistance resulting from; the engagement between the parts thus pro` duced cannot be oif'ercome. rlChe action of the canrlecl which produces this binding effect will be readily understood. It is usually necessary, therefore, in opening the window to hold the fastener in such a way that the low part of thc cam-lock 5 is pre-il sented to the sash. To facilitate this latter operation on the part of the upper-sash fas-` tener, a cord let may be attached to the free, end of the tail-piece 12. Thus bly drawing' the cord illdownward the fastener will be rocked on its pivot to throw its vcam-lock out of contact with the sash. A, pin, as 15, may be located in the casing, above the upper` sash fastener, at a point where it will be struck by said fastener, when the latter is` operated by the cord, before the fastener arri ves at the dead-center. `Without this pin the associated fastener would frequently be thrown over into an inoperative position.

its a rule, aft-er the window has been opened to the desired extent, or when it isV to be loeled in its closed position, the tailpiece 8 or l2 is grasped and swung or soft wood, a loose lit, or other causes, some or all, then the motion imparted to the fastener, by the action of the sash on said eamlocl, brings the dead-lock 7 into play, as in Fig. 3. Seldom .will the dead-lock 7 fail to hold, but for any possible .contingency that might arise, wherein the lower-sash fastener is concerned, the dead-lock 9 is present to meet it.; hence, if the first dead-loch does prove inelfectual. for any reason, the movement of said fastener, now induced by the action of the sash on said first dead-lock, forces the second dead-lock into engagement with. said sash, as shown in Fig. 4f. ilVhen the dead-lock 7 is swung, by the action of the cam-lock 5, against the sash, it bites into said sash as the latter continues to he moved in the direction to open the window, and successfully checks further increment in that direction on the part of said sash, unless the parts be very loose indeed or for some other reason the force exerted on the ance offered by said deadmlock. ln nearly all cases the dead-lock 7 holds and the window cannot possibly bc forced farther in the direction. to open it, because the distance between the pivotal point 11 or 13 and said dead-lock is so much greater than the distance between said point and the nearest point on the sash, and the engagement between the fastener and sash is positive.

As hereinbefore intimated, the deadlock 7 may 4fail yto hold, such failure resulting from the splinteringl of the wood of the sash where it is engaged by said deadlock, or from some other cause, in which event the fastener for the lower sash, provided it be the lower sash and its fastener that are involved, is swung by said deadlock, under the influence of continued force exerted upon the llower1 window to open it, so as to bring the dead-lock 9 into engagement with said sash. The dead-lock 9, like the, deadlock 7, bites into the sash, and, owing to faste-ner, the more the force exerted to open the window the deeper said dead-lock 9 is driven into the wood, the action of the dead-lock 7 in engagement with said sash tending to this end. This locking of the lower window is not only positive but final, because kthe dead-loch 9, after once becom ing engaged with the sash, will hold it, even in the event that an extraordinary force combined with an unusual condition of the window members forces the sash away from the dead-lool; 7, since said sash turned in the proper direction to force the camloelr 5 hard against the sash 2. The .window is now securely locked, and even to close the same it will be necessary frequently first to lor en the fastener through the medium of its tail-piece. For a window which fits the casing with ordinary snugness, the cam-lock 5 all that is required to loch such window, and the greater the force exerted on said window, in the direction to open it and con window is sul'licient to overcome the resistthe construction and arrangement of this i ill cannot free itself from said dead-lock 9. That this is true will be readily seen upon noting the fact that in no case, without actually destroying some part of the window mem'bers, can the tailpiece .8 be forced, by a window in the act of being opened, into a horizontal position, and without being forced into such position the sash of said window cannot free itself from said tailpiece. When the dead-lock 7 is in operative engagement with a sash, the head 4.- is wedged in between the pivot and said sash; and when the dead-lock 9 is in such engagement with a sash, the tail-piece 8 is wedged in between said pivot and said sash. Either deadlock is self-releasing upon the closing of the window, and the cam-lock 5 may be, but if said cam-lock is pressed too tightly against the sash by means of either tail-piece, or by the action of the window, some assistance is sometimes required in order to loosen the fastener, such assistance being given by pressure applied to said tailpieee in the opposite direction to that necessary in the locking operation.

I am awa-re that window fasteners having Cam-locks are old, and do not, therefore, lay claim t0 such a fastener per se.

More or less change in the shape, size, and

construction of this device may be made, of course, without departing from the nature of my invention.

What I claim as my invention, and desire to secure 'by Letters Patent, is`

window fastener having a pivotal mounting point and two lock members, the lirst lock member consisting of a camshaped part having an engaging extremity, as 7, such engaging extremity being at the end of a reverse curve which continues from the cam, and the second lock member consisting of a combined emergency dead lock and handle part projecting at an angle and having a sharp engaging point, as 9, said engaging point being a greater distance from the pivotal point than the engaging eX- tremity of the other member, the relation between the two lock members being such that the point 9 engages the frame before the point 7 is released from the frame, and said point 7 is the means whereby said point 9 is actuated .into engagement with the frame.

DUNCAN L. MCCORKINDALE.

Witnesses:

J. CLARK WEBSTER, GERTRUDE A. CHALMERS.

M Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

